Automatic lumber stamping device



' Feb. 7, 1933. G, LUNDEN 1,896,548

AUTOMATIC LUMBER STAMPING DEVICE Filed March 16, 1931 I I M A WI mix;

i N VEN TOR.

Gus Lunaen Patented Feb. 7, 1933 ens LUNDELL. or COLVILLE, WASHINGTON AUTOMATIC LUMBER STAMPING DEVICE Application filed March 16, 1931. Serial No. 522,804.

UNITED STATES PATENT OFFICE My invention relates to automatic lumber stamping devices and certain objects'of the invention are to provide a stamping device that is adapted to be attached to and actuated by a planer or other lumber machine and whereby the trade letter, number or other insignia of an organization is stamped or mpressed on the ends of the lumber in pass ng through the machine. Further objects are to provide a device of comparatively simple and inexpensive construction, that s positive, eliicient and reliable in its operation, and which embodies certain adjusting details of construction whereby more flexibility and adaptability is provided to meet varying conditions and types of machines, lumber dimensions and other requisites encountered in the operation of lumbering'machines.

With the above and other ob ects in View which will appear as the description proceeds,

the invention consists of the novel construction, adaptation, combination and arrangement .of parts hereinafter described and claimed. These objects are accomphshed by devices [illustrated in the accompanying drawing; wherein: V

Figure 1 is a general View in rearelevation showingthe application of my device as applied to a planer machlne; 7

Fig. 2is an enlarged view in front elevation of the casing and mechanism of the device with the cover removed;

Fig. 3 is a bottom plan View of Fig. 2 with parts broken away; l p

Fig. 4: is an enlarged detall vlew 1n vertical section of the cam and trip mechanism taken substantially on a broken line 4 -4-01? Fig 3;

Fig. 5 is an enlarged detail view in vertical section showing means for securing the d e to the hammer head and taken on a broken line 55 of Fig. 3; and

Fig. 6 is an enlarged detail View in horizontal section of the spring and link connection taken on a broken line66 of Fig. 2.

Referring to the drawing throughout which like reference numerals indicate like parts and moreparticularly to Fig. 1,.the numeral '5 designates a somewhat diagrammatic fragmentary portion of a planer machine and the numeral 6 designates a delivery table which receives the boards or other lumber after they have passed through the planer.= My device comprises a casing 7 which I preferably connect to said planer by means of two extension arms 8 disposed in parallel spaced relation andwhose ends are secured by bolts 9 to the rear side of said casing and to a bracket plate 10 that is fastened to the planer. This arrangement provides means whereby the device may be adjusted up and down in accordance with the thickness of the boards or other pieces of lumber passing thereunder, and wlhich boards are designated by the numeral Referring especially to Fig. 2 of the draw- 66 ing, the ends of the boards 11, as they emerge from the planer 5, engage the end portion of a lever arm 12 projecting through an opening in the bottom of the casing/7. Said arm is pivoted at 13 to the casing and is normally (0 held in the retracted position by a coiled spring 1 1 connected thereto at 15 and .to the casing at 16. In its normally retracted position the end portionof said arm rests against a shoulder 17, formed'by the forward edge of 76 the opening in the casing bottom, and projects exteriorly of the casing in readiness to be engagedrby a board as. aforesaid. j

V The remote or extended end of the lever arm 12 has the eye end of a bolt 18'pivotally so connected thereto and the threaded end of said bolt is connected to the offset end of a trigger or dog 19 by means of jam nuts 20. The notch end of said trigger engages a shoulder 21 on the periphery of a cam member 22 and is. held in engagement therewith by a leaf spring 23. Said cam is eccentrically pivoted to the casing 7 by a bolt 24 and a hammer 25 is integrally or otherwise fixedly connected to said cam. The head of said hammer is recessed, as at 26, to receive a die 27 that is locked therein by a bolt 28 as most clearly shown in Fig. 5. j

The cam 22 is provided on its underside with a segmental slot 29 and a link member 30 has its inner end pivotally connected there'- in at 31. The outer end of said link is pivotally connected to a coiled spring 32 by a bolt 33 and preferably by means of a double sleevearrangement as shown in detail at 34 in Fig. 6. The remote end of said coiled spring is secured to the casing 7 at 35 and said spring retains the upper edge of said link against the upper wall 86 of the segmental slot at all times when said link is in the normal position as shown in full lines in Fig. 4.

In the normal position of the hereinbefore described elements as most clearly shown in full lines in Fig. 2 of the drawings, the hammer 25 is at rest and completely housed within the casing 7 hen the end of a board 11 has pivotally carried the lever arm 12 to some intermediate position, as shown at 37 in dotted lines, it will have retracted the trigger 19 whereby the cam 22 will have raised said hammer to the striking position within the casing as shown in dotted lines.

At this time the trigger 19 will slip off of the cam shoulder 21 thus releasing the hammer 25. At the same time the cam 22 will have carried the link member 30, that is in engagement with the upper wall 36 of the segmental slot 29, downwardly and around to the dotted position, together with the spring 32, whereby considerable tension will have been created in said spring. This tension, when the cam is released from the trigger, will cause violent rotary movement of said cam as said spring returns to its normal position and said cam will swing the hammer downwardly through the opening in the bottom of the casing 7 causing the hammer head to strike sharply against the end of the board or other piece of lumber.

The die 27 is provided with a raised letter, number or other mark, as shown at 38, which mark will be caused to impress itself into the end of the board 11 by the somewhat violent downward stroke of the hammer 25. Said board or other piece of lumber will, of course, continue to move forward thus raising the lever arm 12 and retaining same in its ultimate dotted position as shown in Fig. 2 until the board drops from the planer 5 to the delivery table 6 at which time said lever arm will be released and will be caused to return to its normal retracted position by the spring 14. Thus the trigger 19 will again be caused to take its hold on the shoulder 21 of the cam 22 which has already been retracted to its normal position by the spring 32 and the device will again be in readiness for marking the next board or other piece of lumber as will be understood.

In addition to the adjustable extension arms 8 the device has certain other adjustable features, such as a set screw 39 threaded into an oifset end portion 40 of the trigger 19 and which screw is adapted to engage the hammer 25, as clearly shown in Fig. 3, whereby the upward limit of the movement of said hammer may be varied by turning said set screw. The jam nuts 20 may also be turned back and forth to move the said trigger toward or away from the cam shoulder 21 whereby the length of the hammer stroke may be varied to suit the speed of the board 11 which is governed by the particular planer machine in use. It will also be understood that free movement of the cam 22 and its hammer 25, in its downward stroke, is provided by the segmental slot 29 which permits said cam to move without retardation by the link member 30.- The eccentric disposition of the pivot bolt 24: for the cam provides more space in said cam for the segmental slot and a longer upper bearing wall 36 for en gagement by the link member.

It will now be apparent that I have provided an automatic lumber stamping device that is actuated indirectly by the planer or other machine to which it is attached, that is positive and direct in stamping the ends of lumber, which is comparatively simple and inexpensive in construction, and which embodies adjustable means for attachment to different types of machines and with different speeds and is adapted for stamping lumber of different cross sectional dimensions.

Having thus described my invention, it being understood that minor changes in its construction and arrangement may be made without departing from the scope and spirit of the invention, what I claim and desire to secure by Letters Patent of the United States is An automatic lumber stamping device hav ing in combination a casing, a lever arm pivotally mounted in the casing with one of its ends normally projecting through an opening in the bottom of said casing, a spring arranged to normally retain said lever in the retracted position, a trigger, adjustable connecting means between the lever and trigger, a cam eccentrically pivoted to the casing, a shoulder for said cam adapted to be engaged by said trigger, a spring arranged to normally retain said trigger in engagement with said shoulder, a hammer fixedly connected to the cam, a die for the head end of the hammer, said cam having a segmental slot, a link member having one end pivotally mounted in said slot with its upper edge normally in engagement with the upper wall thereof, a spring pivotally connected to the other end of said link and to the casing whereby said link and cam are retained in the normal position, said lever adapted to impart rotary movement to the cam, lifting the hammer and creating tension in the spring connected to the cam when the exterior end of said lever is moved forward, adjustable means for regulating the limits of the upward movement of the hammer, said trigger adapted to release its hold on the cam shoulder at a predetermined position whereby the tension of said spring causes the hammer to swing downwardly through the bottom casing opening, and said springs adapted to cause the lever arm, hammer and trigger to return to their respective normal positions when the exterior end of the lever is released.

In testimony whereof I aflix my signature.

GUS LUN DEN. 

